derives Error trait for ClusterInfoError and core::result::Error (backport #27208)

core/src/result.rs

@@ -3,53 +3,42 @@
 use {
     solana_gossip::{cluster_info, gossip_error::GossipError},
     solana_ledger::blockstore,
+    thiserror::Error,
 };
 
-#[derive(Debug)]
+#[derive(Debug, Error)]
 pub enum Error {
-    Io(std::io::Error),
-    Recv(crossbeam_channel::RecvError),
+    #[error(transparent)]
+    Blockstore(#[from] blockstore::BlockstoreError),
+    #[error(transparent)]
+    ClusterInfo(#[from] cluster_info::ClusterInfoError),
+    #[error(transparent)]
+    Gossip(#[from] GossipError),
+    #[error(transparent)]
+    Io(#[from] std::io::Error),
+    #[error("ReadyTimeout")]
     ReadyTimeout,
-    RecvTimeout(crossbeam_channel::RecvTimeoutError),
-    TrySend,
-    Serialize(std::boxed::Box<bincode::ErrorKind>),
-    ClusterInfo(cluster_info::ClusterInfoError),
+    #[error(transparent)]
+    Recv(#[from] crossbeam_channel::RecvError),
+    #[error(transparent)]
+    RecvTimeout(#[from] crossbeam_channel::RecvTimeoutError),
+    #[error("Send")]
     Send,
-    Blockstore(blockstore::BlockstoreError),
-    WeightedIndex(rand::distributions::weighted::WeightedError),
-    Gossip(GossipError),
+    #[error("TrySend")]
+    TrySend,
+    #[error(transparent)]
+    Serialize(#[from] std::boxed::Box<bincode::ErrorKind>),
+    #[error(transparent)]
+    WeightedIndex(#[from] rand::distributions::weighted::WeightedError),
 }
 
 pub type Result<T> = std::result::Result<T, Error>;
 
-impl std::fmt::Display for Error {
-    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
-        write!(f, "solana error")
-    }
-}
-
-impl std::error::Error for Error {}
-
-impl std::convert::From<crossbeam_channel::RecvError> for Error {
-    fn from(e: crossbeam_channel::RecvError) -> Error {
-        Error::Recv(e)
-    }
-}
 impl std::convert::From<crossbeam_channel::ReadyTimeoutError> for Error {
     fn from(_e: crossbeam_channel::ReadyTimeoutError) -> Error {
         Error::ReadyTimeout
     }
 }
-impl std::convert::From<crossbeam_channel::RecvTimeoutError> for Error {
-    fn from(e: crossbeam_channel::RecvTimeoutError) -> Error {
-        Error::RecvTimeout(e)
-    }
-}
-impl std::convert::From<cluster_info::ClusterInfoError> for Error {
-    fn from(e: cluster_info::ClusterInfoError) -> Error {
-        Error::ClusterInfo(e)
-    }
-}
 impl<T> std::convert::From<crossbeam_channel::TrySendError<T>> for Error {
     fn from(_e: crossbeam_channel::TrySendError<T>) -> Error {
         Error::TrySend
@@ -60,31 +49,6 @@ impl<T> std::convert::From<crossbeam_channel::SendError<T>> for Error {
         Error::Send
     }
 }
-impl std::convert::From<std::io::Error> for Error {
-    fn from(e: std::io::Error) -> Error {
-        Error::Io(e)
-    }
-}
-impl std::convert::From<std::boxed::Box<bincode::ErrorKind>> for Error {
-    fn from(e: std::boxed::Box<bincode::ErrorKind>) -> Error {
-        Error::Serialize(e)
-    }
-}
-impl std::convert::From<blockstore::BlockstoreError> for Error {
-    fn from(e: blockstore::BlockstoreError) -> Error {
-        Error::Blockstore(e)
-    }
-}
-impl std::convert::From<rand::distributions::weighted::WeightedError> for Error {
-    fn from(e: rand::distributions::weighted::WeightedError) -> Error {
-        Error::WeightedIndex(e)
-    }
-}
-impl std::convert::From<GossipError> for Error {
-    fn from(e: GossipError) -> Error {
-        Error::Gossip(e)
-    }
-}
 
 #[cfg(test)]
 mod tests {

gossip/src/cluster_info.rs

@@ -92,6 +92,7 @@ use {
         thread::{sleep, Builder, JoinHandle},
         time::{Duration, Instant},
     },
+    thiserror::Error,
 };
 
 /// The Data plane fanout size, also used as the neighborhood size
@@ -138,12 +139,17 @@ const MIN_STAKE_FOR_GOSSIP: u64 = solana_sdk::native_token::LAMPORTS_PER_SOL;
 /// Minimum number of staked nodes for enforcing stakes in gossip.
 const MIN_NUM_STAKED_NODES: usize = 500;
 
-#[derive(Debug, PartialEq, Eq)]
+#[derive(Debug, PartialEq, Eq, Error)]
 pub enum ClusterInfoError {
+    #[error("NoPeers")]
     NoPeers,
+    #[error("NoLeader")]
     NoLeader,
+    #[error("BadContactInfo")]
     BadContactInfo,
+    #[error("BadGossipAddress")]
     BadGossipAddress,
+    #[error("TooManyIncrementalSnapshotHashes")]
     TooManyIncrementalSnapshotHashes,
 }